With the midterm elections just days away, there’s little indication that California is seeing a “blue wave” of Democratic votes, at least in the early returns of vote-by-mail ballots — and in some key races that will help determine control of the House, Republican voter response has been strong. There are still a lot more ballots to come in, cautioned Paul Mitchell, vice president of Political Data Inc., which supplies voter information to a variety of political campaigns. But so far, according to a mail ballot tracker he runs, Republican votes are keeping pace with the number of Democratic ballots....